BEE BEE Bachelor of Electrical Engineering Fundamental Circuit Analysis Questions and Answers 2 — Questions and Answers
Question 1: A 10V source is connected across two parallel resistors of 20Ω and 30Ω. What is the total current drawn from the source?
- 0.833 A (Correct answer)
- 0.500 A
- 1.200 A
- 0.667 A
Correct answer: 0.833 A
The parallel combination is (20×30)/(20+30) = 12Ω, so I = 10/12 ≈ 0.833 A.
Question 2: In a series RLC circuit at resonance, which statement is true?
- The impedance is purely resistive and at its minimum value (Correct answer)
- The impedance is at its maximum value
- The current through the circuit is at its minimum
- The voltage across the capacitor is zero
Correct answer: The impedance is purely resistive and at its minimum value
At series resonance, inductive and capacitive reactances cancel, leaving only resistance as the impedance.
Question 3: What is the time constant of a series RC circuit with R = 4.7 kΩ and C = 22 μF?
- 103.4 ms (Correct answer)
- 47.0 ms
- 213.4 ms
- 22.0 ms
Correct answer: 103.4 ms
τ = RC = 4700 × 22×10⁻⁶ = 0.1034 s = 103.4 ms.
Question 4: Using the superposition theorem, how are individual source contributions combined to find the total response?
- By algebraically adding the individual responses (Correct answer)
- By multiplying the individual responses
- By taking the RMS of the individual responses
- By selecting the largest individual response
Correct answer: By algebraically adding the individual responses
Superposition states that the total response in a linear circuit equals the algebraic sum of responses due to each independent source acting alone.
Question 5: A node in a circuit has three branches carrying currents of 3 A (in), 5 A (in), and I (out). What is I?
- 8 A (Correct answer)
- 2 A
- 5 A
- 15 A
Correct answer: 8 A
By Kirchhoff's Current Law, currents entering a node equal currents leaving, so I = 3 + 5 = 8 A.
Question 6: What is the Thevenin equivalent voltage across terminals A-B if an open-circuit measurement reads 15V?
- 15 V (Correct answer)
- 0 V
- 7.5 V
- 30 V
Correct answer: 15 V
The Thevenin voltage equals the open-circuit voltage measured across the terminals, which is 15V.
BEE BEE Bachelor of Electrical Engineering Fundamental Circuit Analysis Questions and Answers 2
A 10V source is connected across two parallel resistors of 20Ω and 30Ω.
What is the total current drawn from the source?